Cardiff School of Sport, University of Wales Institute Cardiff, Cardiff.
J Sports Sci. 2009 Dec;27(14):1565-73. doi: 10.1080/02640410903311572.
The aim of the study was to assess the reliability of a mobile contact mat in measuring a range of stretch-shortening cycle parameters in young adolescents. Additionally, vertical leg stiffness using contact mat data was validated against a criterion method using force-time data. The reliability study involved 18 youths completing a habituation and three separate test sessions, while 20 youths completed a single test session for the validity study. Participants completed three trials of a squat jump, countermovement jump, and maximal hopping test and a single trial of repeated sub-maximal hopping at 2.0 Hz and 2.5 Hz. All tests were performed on the contact mat. Reliability statistics included repeated-measures analysis of variance, intraclass correlation coefficient, and coefficient of variation (CV), while the correlation coefficient (r) and typical error of estimate (TEE) were reported for the validity study. Squat jump height was the most reliable measure (CV = 8.64%), while leg stiffness during sub-maximal hopping, and reactive strength index produced moderate reliability (CV = 10.17-13.93% and 13.98% respectively). Measures of leg stiffness obtained from contact mat data during sub-maximal hopping were in agreement with the criterion measure (r = 0.92-0.95; TEE = 6.5-7.5%), but not during maximal hopping (r = 0.59; TEE = 41.9%). The contact mat was deemed a valid tool for measuring stretch-shortening cycle ability in sub-maximal but not maximal hopping. Although reliability of performance was generally moderate, the tests offer a replicable assessment method for use with paediatric populations.
本研究旨在评估一款移动接触垫在测量青少年一系列伸展-缩短循环参数时的可靠性。此外，使用接触垫数据测量的垂直腿部刚度与使用力-时间数据的标准方法进行了验证。可靠性研究涉及 18 名青少年完成适应期和三个单独的测试阶段，而 20 名青少年完成了一个单一的测试阶段进行有效性研究。参与者完成了三次深蹲跳、反向跳和最大跳跃测试，以及在 2.0Hz 和 2.5Hz 下进行的单次重复亚最大跳跃测试。所有测试均在接触垫上进行。可靠性统计包括重复测量方差分析、组内相关系数和变异系数（CV），而有效性研究则报告了相关系数（r）和典型估计误差（TEE）。深蹲跳高度是最可靠的测量指标（CV=8.64%），而在亚最大跳跃时的腿部刚度和反应强度指数产生了中等可靠性（CV=10.17-13.93%和 13.98%）。在亚最大跳跃时，从接触垫数据获得的腿部刚度测量值与标准测量值一致（r=0.92-0.95；TEE=6.5-7.5%），但在最大跳跃时不一致（r=0.59；TEE=41.9%）。接触垫被认为是一种在亚最大跳跃而不是最大跳跃时测量伸展-缩短循环能力的有效工具。尽管性能的可靠性通常是中等的，但这些测试为使用儿科人群提供了一种可重复的评估方法。
